1 | import React from "react"
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2 | import loader from "./loader"
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3 | import shallowCompare from "shallow-compare"
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4 |
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5 | class EnsureResources extends React.Component {
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6 | constructor(props) {
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7 | super()
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8 | const { location, pageResources } = props
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9 | this.state = {
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10 | location: { ...location },
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11 | pageResources: pageResources || loader.loadPageSync(location.pathname),
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12 | }
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13 | }
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14 |
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15 | static getDerivedStateFromProps({ location }, prevState) {
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16 | if (prevState.location.href !== location.href) {
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17 | const pageResources = loader.loadPageSync(location.pathname)
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18 | return {
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19 | pageResources,
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20 | location: { ...location },
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21 | }
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22 | }
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23 |
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24 | return null
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25 | }
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26 |
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27 | loadResources(rawPath) {
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28 | loader.loadPage(rawPath).then(pageResources => {
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29 | if (pageResources && pageResources.status !== `error`) {
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30 | this.setState({
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31 | location: { ...window.location },
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32 | pageResources,
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33 | })
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34 | } else {
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35 | window.history.replaceState({}, ``, location.href)
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36 | window.location = rawPath
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37 | }
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38 | })
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39 | }
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40 |
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41 | shouldComponentUpdate(nextProps, nextState) {
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42 |
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43 | if (!nextState.pageResources) {
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44 | this.loadResources(nextProps.location.pathname)
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45 | return false
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46 | }
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47 |
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48 |
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49 | if (this.state.pageResources !== nextState.pageResources) {
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50 | return true
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51 | }
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52 | if (
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53 | this.state.pageResources.component !== nextState.pageResources.component
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54 | ) {
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55 | return true
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56 | }
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57 |
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58 | if (this.state.pageResources.json !== nextState.pageResources.json) {
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59 | return true
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60 | }
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61 |
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62 |
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63 | if (
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64 | this.state.location.key !== nextState.location.key &&
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65 | nextState.pageResources.page &&
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66 | (nextState.pageResources.page.matchPath ||
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67 | nextState.pageResources.page.path)
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68 | ) {
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69 | return true
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70 | }
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71 | return shallowCompare(this, nextProps, nextState)
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72 | }
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73 |
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74 | render() {
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75 | return this.props.children(this.state)
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76 | }
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77 | }
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78 |
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79 | export default EnsureResources
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